linux-kernel - Re: [PATCH v8 0/5] auxdisplay: add support for TI LP5812 4x3 Matrix LED driver

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Message-ID: <CAHp75VcXmOByVsuwm0m0+FYXoaxBc1CLKtofGgHfB4sMDg+T2A@mail.gmail.com>
Date: Mon, 12 May 2025 20:44:23 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Nam Tran <trannamatk@...il.com>
Cc: andy@...nel.org, lee@...nel.org, geert@...ux-m68k.org, pavel@....cz, 
	robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org, 
	christophe.jaillet@...adoo.fr, corbet@....net, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, 
	florian.fainelli@...adcom.com, bcm-kernel-feedback-list@...adcom.com, 
	linux-rpi-kernel@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v8 0/5] auxdisplay: add support for TI LP5812 4x3 Matrix
 LED driver

On Mon, May 12, 2025 at 8:38 PM Nam Tran <trannamatk@...il.com> wrote:
> On Mon, 12 May 2025 Andy Shevchenko wrote:
> > On Sat, May 10, 2025 at 02:48:02PM +0700, Nam Tran wrote:
> > > On Thu, 8 May 2025 Lee Jones wrote:
> > > > On Thu, 08 May 2025, Andy Shevchenko wrote:
> > > > > On Thu, May 8, 2025 at 5:27 PM Nam Tran <trannamatk@...il.com> wrote:
> > > > > > On Thu, 8 May 2025 Lee Jones wrote:
> > > > > > > On Thu, 08 May 2025, Andy Shevchenko wrote:

...

> > > I think setting PWM also same as brightness_set API. However, there are
> > > many PWM config for a LED and it is one of other config to make autonomous mode work.
> > > Therefore, standard led API can use in some use cases only.
> > >
> > > Please see the link below for a better visualization of how to configure the LP5812.
> > > https://dev.ti.com/gallery/view/LED/LP581x/ver/0.10.0/
> >
> > To me it sounds like you should start from the small steps, i.e. do not
> > implement everything at once. And starting point of the 4 RGB LEDs sounds
> > the best approach to me. Then, if needed, you can always move on with
> > fancy features of this hardware on top of the existing code.
>
> Thanks for the suggestion.
> I understand your point and agree that starting with standard LED APIs is the preferred approach.
>
> However, the LP5812 hardware offers more advanced features, and I’d like to support end users all
> features as shown in the link: https://dev.ti.com/gallery/view/LED/LP581x/ver/0.10.0/.
> It is easy for end user to investigate and use driver.

I see. Good luck then!

> If I want to keep the current driver interface to meet this expectation, would it be acceptable
> to move it to the misc subsystem to better support the hardware?

Don't ask me, I don't know what you want at the end and I have not so
much time to invest in this anymore. Only what I'm sure about I
already expressed in the previous replies and emails.

-- 
With Best Regards,
Andy Shevchenko